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Per Table B for MIN Fire , change dip switch 6 to OFF and 7 to ON. The unit will cycle down to MIN Fire.
WAIT for your combustion Analyzer to stabilize. Then check the CO 2 measurement at MIN fi re. Refer to
Page 36
Table D for acceptable MIN fi re combustion readings.
If CO 2 readings in Max Fire and MIN fi re are acceptable, then skip ahead to Step 23. If not, then open the
Gas Valve Adjustment Port by removing the cap screw with a 4mm Allen wrench. See Figure E.
4.11 Gas Adjustment (continued)
Then use the 4 mm Allen wrench to make a minor adjustment (1/8 turn) to either increase or decrease CO 2 .
Manifold pressure
MAX Fire
FTCF140
MIN Fire
MAX Fire
FTCF199
MIN Fire
Table C
value
CO
2
MAX Fire
FTCF140
MIN Fire
MAX Fire
FTCF199
MIN Fire
20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355
Table D
9. WAIT for your combustion analyzer to stabilize.
This may take up to 3 minutes depending on
your combustion analyzer. Then check the CO 2
measurement for MAX fire. Refer to Table D for
acceptable MAX fire combustion readings. At this
point, just record the CO 2 readings at MAX Fire.
Do NOT adjust CO 2 at MAX Fire.
Only adjust CO 2 in Min Fire operation. Refer
to Table D for acceptable MAX fire combustion
readings.
10. Change to MIN Fire operation per Table B, change
dip switch 6 to OFF and 7 to ON. The unit will cycle
down to MIN Fire.
11. WAIT for your combustion analyzer to stabilize. Then
check the CO 2 measurement at MIN fire. Refer to
Table D for acceptable MIN fire combustion readings.
12. If CO 2 readings in Max Fire and MIN fire are
acceptable, then skip ahead to Step 13. If not, then
open the Gas Valve Adjustment Port by removing the
cap screw with a 4mm Allen wrench. See Figure E.
13. Then use the 4 mm Allen wrench to make a minor
adjustment (1/8 turn) to either increase or decrease
CO 2 .
Gas Type 'NG'
2" VENT
3" VENT
"
-0.15
WC
-0.216
"
WC
0.002
0
"
-0.134
WC
"
-0.015
WC
Gas Type 'NG'
2" VENT
3" VENT
8.5~10.5%
8~10%
8.5~10.0%
800.900.9276 • Fax 800.559.1583
8~10%
1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130
www.Laars.com
Gas Type 'LP'
2" VENT
3" VENT
"
"
WC
-0.15
WC
-0.216
"
"
WC
0.1
WC
0.079
"
-0.173
WC
"
-0.015
WC
Gas Type 'LP'
2" VENT
3" VENT
9.5~11 %
9~10.5 %
9.5~11 %
9~10.5 %
(Customer Service, Service Advisors)
14. It may be necessary to go back and forth
between HI Fire and LOW Fire several times
(and adjusting ONLY at LOW Fire), before CO 2
at both are within acceptable levels. Be sure
to put the cap screw back onto the gas valve
adjustment port when done.
15. Once the CO 2 and manifold pressure
measurements for both MIN and MAX Fire are
acceptable per Table D, set DIP switches 6 and
7 to the OFF position for Nominal Fire (normal
operation). The FT is now operating in its normal
mode.
16. Remove your combustion analyzer from the
combustion test port and be sure to thread the
test port plug back into position.
17. Re-connect outdoor reset if it was disconnected
previously in this conversion and put the Front
Panel and Top Access Panel back on. Tighten
them into place using the 4 fasteners that you
loosened in step 2.
"
WC
"
WC
(Applications Engineering)
pg 3 of 4
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